Motor for heat-regulators.



w. LARSON.

MOTOR FOR HEAT REGULATOR.

APPLICATION FILED MAR. 12, 1917.

1398,81 L Patented Feb.11,1919.

2 SHEETS-SHEET I.

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w. LARSON.

MOTOR FOR HEAT REGULATOR.

APPLICATION FILED MAR. 12, 1911.

Patented Feb. 11, 1919.

2 SHEETS-SHEET 2.

WILLIAM LARSON, OF MINNEAPOLIS, MINNESOTA.

Moron Fon HEAT-REGULATORS.

Specification of Letters Patent.

Patented Feb. 11, 1919.

Application filed March 12, 1917. Serial No. 154,421.

To all whom it may concern Be it known that 1, WILLIAM LARSON, a citizen of the United States, residing at Min neapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Motors for Heat-Regulators; and I do hereby declare the following to be a full, clear, and exact de scription of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. 7

My invention has for its object to provide an extremely simple and highly efficient motor especially adapted for use in connection with a thermostat for regulatin heat by manipulating the dampers of a urnace or other heater. Generally stated the invention consists of the novel devices and combi nations of devices hereinafter described and defined in the claims.

The invention is illustrated in the accompanying drawings wherein like characters indicate like parts throughout the several views. Referring to the drawings:

Figure 1 is a view chiefly in elevation, but with some parts in vertical section, showing the manner in which the motor is adapted to be installed and connected to the draft and check dampers of an ordinary furnace or heater; 8

Fig. 2 is a side elevation of the motor, some parts being sectioned and illustrating, diagrammatically, electrical connections between the same and a thermostat;

Fig. 3 is anedge elevation of the motor shown in Fig. 2, some parts being sectioned;

Fig. fl: is a detail showing. a pawl and ratchet connection between the'driving shaft and weight-actuated wheel .of the motor;

Fig. 5 is a fragmentary view in side elevation illustrating the action of certain of the parts of the motor; and

Fig. 6 is, an edge elevation of the driver lever shown in Fig. 5. i

The numeral 6 indicates a furnace or heater having the usual draft damper 7 and check damper 8. The numeral 9 indicates the first floor structure of a building, it being assumed that the furnace is located in the basement- V Allof the parts of the motor proper are preferably mounted upon an upright base,

preferably, in the form of a sheet metal plate 10 having a laterally bent flange to fasten t e same, This base 10 as shown, is secured to a bracket 11, which, in turn, is supported by a post 12.

The driving shaft 13 of the motor is horizontally disposed and is journaled in the sleeve-like bearing of a bearing bracket 14: that is rigidly secured to the base 10. To the front end of the driving shaft 13 is rigidly secured an arm 15 that projects in diametrically opposite directions and, at its ends, has laterally turned stop flanges 16. At one point concentric to its journal, the driver arm 15 is provided with a crank pin 18. This crank pin 18, at its outer end, has a crank arm 18 that is rigid in respect thereto and in respect to the arm 15, but is offset from the said arm 15. At its extended end, the crank arm 18 is provided with an outwardly projected crank pin 19.

At its rear end, the shaft 13 has a crank arm 20 equipped with a crank pin 21 that is at a point diametrically opposite to the crank pin 18. Loosely mounted on the shaft 13 between the sleeve of the bracket 14 and the hub of the crank 20, is a driving wheel, as shown, in the form of a sprocket 22. This sprocket 22 is equipped with a springpressed dog 23 that engages with. a lug 21 on thehub of the crank arm 20 and causes the said shaft and crankto rotate with the said wheel in one direction under the action of a weight 25 attached to the lower end of a sprocket chain 26 that runs on and is secured to said sprocket 22. The crank pin 18 is connected to one end of a chain or cable 27, and the crank pin 21 is connected to one end of a similar chain or cable 28. The chain 27 runs over suitable guide sheaves 29 and 30 and the chain 28 runs over suitable guide sheaves 31 and 32, which guide sheaves are mounted on suitable overhead supports, such as the floor structure 9. The extended end of the chain 27 is connected to the check damper 8, and the extended end of the cable 28 is connected to the draft damper 7 ofthe furnace. Obviously, these two cranks, under rotation of the shaft 13, will open and close the two dampers'7 and 8 in alternate order, this being the usual operation of the motor of a heatmg system. p

The numeral 33 indicates 'electromagnets secured to an upper end flange of the base 10. The numeral 3 1 indicates an armature that is pivoted to the back at 35, the free end of which is limited in its downward movement by a stop 36 fixed on said base. This armature 3.4 is subject to the magnets 33 when the latter are energized, and it is provided with an escapement stop in the form of a stop finger 37 rigidly secured thereto at one end and normally lying in the path of movement of an escapement lever 38 that is secured to one end of a small spindle 39 rotatively mounted in a suitable bearing on the base plate 10.

Rigidly secured to the spindle 39 adjacent to the rotary escapement lever 38' is a flat hub or stop plate 40 that is normally engaged by the free end of a leaf spring 41, one end of which is rigidly secured to a stud 42 on the said base plate. The hub of the main arm 15 carries spring contacts 43 that are engageable with contact screws 44 that are supported by, but insulated from, the base 10 and bearing bracket 14.

The numeral 45 indicates a thermostat of the usual well known construction. This thermostat has three leads 46,. 47 and 48. A battery, or source of electrical energy 49 is interposed in the lead 46 and this lead is connected to one terminal ofthe electromagnets 33 and the other terminal of said electromagnets being grounded in the base 10 through a Wire 50. The leads 47 and 48 connect one to each. of the contact screws The exact arrangement and operation ofthis electrical feature of the apparatus is well known and, as itdoes not per 86, constitute a part of the. present invention, need not be further considered, other than to state that the circuit through the electromagnets will. be closed whenever the contacts 43 engage the contact screws 44.

With the crank pin 21 turned downward and the crank pin 18 turned upward, the draft damper 7 will be open and the check damper 8' will be closed, as shown in Fig. 1. This is the position of the parts shown in Figs. 1, 2 and 3, at which time the uppermost end lug 16 of the arm 15 engages the escapement lever 38 above its pivot. 39 and holds the upper end of said escapement lever against the end. of the stop flange 37 of the armature 34. When the electromagnets 33 are energized by manipulation of the thermostat under increased temperature, the armature 34 will be raised, thereby carrying its finger 37 above, and out of the path of movement of the upper end of the escapement lever 38,. and, then the weight 25 will become active to move the said. arm15 and cranks, carried thereby. Thev initial movementof the arm 15 breaks the magnet circuit. and causes the armature 3.4, immediately, to drop so that its finger 37 will stand in position to stop the upwardly moving opposite end of the said escapement lever. When the arm 15 is thus intercepted, the crank pin- 21 will be raised and the crank in 1'8 lowered, thereby-closing the damper and opening the damper 8., The parts will. then remain this position until the magnet circuit is again closed by lower temperature acting" through the thermostat.

When the rotary escapement lever 38 is moved by the arm 15, it will be given an ap proximately half rotation, and this half rotation will be completed by the action of the spring 41 on the fiat hub 40. Fig. 5 shows the position. of this escapement lever when not engaged by the arm 15, and here it will be noted that in this position of said escapement lever, it cannot interfere with the return'movement of the armature and its stop flange to normal-position, but nevertheless, its upwardly projected end is held Within the line of movement of the laterally bent lug at the upper end of said arm 15. The said arm will, therefore, engage the said escapement lever and move the same into contact. with the stop finger 37 whereupon the said parts will be stopped until again released.

The spring-pressed dog 23 permits the weight 25 to be raised and thezsprocket 22 to be rotated backward, as. then required, without moving the driving shaft 13 or its cranks.

To prevent. too limited movement. of the arm 15,, when released, and under the action of the weight 25, I provide a dashpot 51 which is secured to the lower portion of the base 10 and contains a liquid, preferably oil. Working within this dashpot is a'piston 52 which has a leakage passage, such as a small perforation 53. This piston 52 is connected by a long crank rod 54 to the heretofore noted crank pin 19 of the main arm 15.

The arm 15 is preferably, and as shown, in the form of an arm but it might take other forms. 7 It, together with its shaft, may be properly designated as a crank drive or carrier, because it drives or carries the cranks or elements for manipulating the dampers, orfor doing other useful work.

What I claim is: 1. In a motor of the kind described, the combination with a rotary drive movable in a constant direction and having diametrically projected stop arms, of a rotary escapement lever having diametrically extended arms, the arms. of said drive. having lateral projections for direct engagement of the arm with said escapement lever, an escapement stop engageable directly with the bee ends of the arms of said escapementlever to normally hold said lever against rotation, and tripping means for said escapement Stops. I I

2.. In a motor of the. kind described, the combination with a rotary drive, movable in a constant direction and having diametri-- cally projected stop arms, of a rotary cs capement lever having diametrically ex tended arms, the arms of. said drive having lateral projections for direct engagementlot the arm with said escapement lever, an esdrive, when said escapement lever is released 10 capement stop engagealble directly With the from said escapement stop. free ends of the arms of said escapement In testimony whereof I afiix my signature lever to normally hold said leveg against in presence of two Witnesses.

5 rotation, tripping means or sai escape- I ment stop, and a spring device yieldingly WILLIAM LARSON operative on said escapement lever to hold Witnesses: the same Within the path of movement of CLARA DEMAREs'r, the lateral projection of the arms of said BERNIGE G. WHEELER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

